LT4275

PRODUCTION

LTPoE++/PoE+/PoE PD Controller

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Part Models
24
1ku List Price
Starting From $1.12
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    Part Details

    • IEEE 802.3af/at and LTPoE++™ Powered Device (PD) Controller
    • LTPoE++ Supports Power Levels Up to 90W
    • LT4275A Supports All of the Following Standards:
      • LTPoE++ 38.7W, 52.7W, 70W and 90W
      • IEEE 802.3at 25.5W Compliant
      • IEEE 802.3af Up to 13W Compliant
    • LT4275B is IEEE 802.3at/af Compliant
    • LT4275C is IEEE 802.3af Compliant
    • 100V Absolute Maximum Input Voltage
    • Wide Junction Temperature Range (–40°C to 125°C)
    • Overtemperature Protection
    • Integrated Signature Resistor
    • External Hot Swap™ N-Channel MOSFET for Lowest Power Dissipation and Highest System Efficiency
    • Programmable Aux Power Support as Low as 9V
    • Optional Support of Non-Standard Low Voltage PoE
    • Available in 10-Lead MSOP and 3mm × 3mm DFN Packages
    LT4275
    LTPoE++/PoE+/PoE PD Controller
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    Documentation

    Data Sheet 1

    Reliability Data 2

    User Guide 2

    Design Note 1

    Technical Articles 2

    Data Sheet

    This is the most up-to-date revision of the Data Sheet.

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    Software Resources

    Can't find the software or driver you need?

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    Hardware Ecosystem

    Parts Product Life Cycle Description
    Analog Temperature Sensors 1
    LTC2997
    		PRODUCTION Remote/Internal Temperature Sensor
    Ideal Diode Bridge 1
    LT4320
    LT4320-1
    		Ideal Diode Bridge Controller
    PoE Power Sourcing Equipment (PSE) 2
    LTC4270
    		PRODUCTION 12-Port PoE/PoE+/LTPoE++ PSE Analog Controller
    LTC4266A
    LTC4266C
    		Quad PoE/PoE+/LTPoE++ PSE Controller
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    Tools & Simulations

    LTspice 2

    Models for the following parts are available in LTspice:

    • LT4275A
    LTspice

    LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

    Evaluation Kits

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    AD-PS3803-RD

    PoE+ with Ideal Diode Bridge to Isolated Flyback DC/DC (12V, 2A)

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    Features and Benefits

    • Galvanically isolated 12V flyback DC output with up to 24 W of output power capability
    • No Transformer third winding or Opto-Isolator for output regulation
    • Supports IEEE802.3at (PoE+, Type 2) and IEEE802.3bt (PoE++, Type 3 and 4) interfacing and power supply control via a configurable jumper array
    • Supports a wide input DC auxiliary power of 37V to 57V

    Product Details

    The AD-PS3803-RD reference design is a power converter capable of harnessing any IEEE802.3at (PoE+, Type 2) compliant downstream Power-Over-Ethernet (PoE) supply to provide a galvanically isolated DC power.

    At the core of this solution is the LT8306 60V No-Opto Flyback controller, stepping down the 37V to 57V PoE input voltage to a 12V, 24W DC output.

    The on-board LT4275 LTPoE++/PoE+/PoE power delivery (PD) controller handles interfacing and power delivery to any PoE supply.

    The LT4321 ideal diode bridge controller is used for improved end-to-end power delivery efficiency and eased thermal design by utilizing low RDS(ON) N-Channel FETs, replacing the eight-diode configuration typically found in passive PoE rectifier bridge.

    The AD-PS3803-RD also has auxiliary DC power support for a wide input range of 37V to 57V.

    APPLICATIONS

    • Industrial Automation
    • Surveillance Camera Systems
    • VoIP Phones
    • Payment Terminal Systems
    • Wireless Access Points

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    DC2093A-A

    LT4275A/LT4321 LTPoE++/PoE+/PoE PD Demo Board

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    Product Details

    DC2093A-A Demo Board for:
    LT4275 LTPoE++/PoE+/PoE PD Controller
    LT4321 PoE Ideal Diode Bridge Controller

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    DC2093A-B

    LT4275B/LT4321 PoE+/PoE PD Demo Board

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    Product Details

    DC2093A-B Demo Board for:
    LT4275 LTPoE++/PoE+/PoE PD Controller
    LT4321 PoE Ideal Diode Bridge Controller

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    schematic 17
    DC2093A-C

    LT4275C/LT4321 PoE PD Demo Board

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    Product Details

    DC2093A-C Demo Board for:
    LT4275 LTPoE++/PoE+/PoE PD Controller
    LT4321 PoE Ideal Diode Bridge Controller

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    DC2125A

    LT4275/LT4321/LTM8027 Demo Board | LTPoE++ PD Plus Diode Bridge and DC/DC Controller

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    Product Details

    Demonstration circuit 2125 is a small, highly-integrated, non-isolated PoE Powered Device (PD) solution. It features a PD Interface Controller (LT4275), which interfaces with a PoE Power Sourcing Equipment (PSE), an ideal diode bridge controller (LT4321), which minimizes bridge losses, and a DC/DC μModule® regulator (LTM8027).
    AD-PS3803-RD
    PoE+ with Ideal Diode Bridge to Isolated Flyback DC/DC (12V, 2A)
    DC2093A-A
    LT4275A/LT4321 LTPoE++/PoE+/PoE PD Demo Board
    DC2093A-B
    LT4275B/LT4321 PoE+/PoE PD Demo Board
    DC2093A-C
    LT4275C/LT4321 PoE PD Demo Board
    DC2125A
    LT4275/LT4321/LTM8027 Demo Board | LTPoE++ PD Plus Diode Bridge and DC/DC Controller

    Latest Discussions

    5 Weeks Ago
    Implementing PoE circuit to support both Active and Passive POE using LT4321/LT4275/MAX1617
    33 Weeks Ago
    LT4275C is not negotiating with IEEE802.3A POE Switch.
    1 Years Ago
    LT4275 POE controller no powergood
    View related discussion on EngineerZone®

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